package com.srpingde.hhh;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONUtil {
	private static final String TAG = "JSONUtil";  
    
    /** 
     * ��ȡjson���� 
     * @param  url 
     * @return JSONArray 
     * @throws JSONException  
     * @throws ConnectionException  
     */  
    public static JSONObject getJSON(String url) throws JSONException, Exception {  
        return new JSONObject(getRequest(url));  
    }  
      
    /** 
     * ��api����get���󣬷��شӺ�̨ȡ�õ���Ϣ�� 
     *  
     * @param url 
     * @return String 
     */  
    protected static String getRequest(String url) throws Exception {  
        return getRequest(url, new DefaultHttpClient(new BasicHttpParams()));  
    }  
      
    /** 
     * ��api����get���󣬷��شӺ�̨ȡ�õ���Ϣ�� 
     *  
     * @param url 
     * @param client 
     * @return String 
     */  
    protected static String getRequest(String url, DefaultHttpClient client) throws Exception {  
        String result = null;  
        int statusCode = 0;  
        HttpGet getMethod = new HttpGet(url);  
        Log.d(TAG, "do the getRequest,url="+url+"");  
        try {  
            //getMethod.setHeader("User-Agent", USER_AGENT);  
  
            HttpResponse httpResponse = client.execute(getMethod);  
            //statusCode == 200 ��  
            statusCode = httpResponse.getStatusLine().getStatusCode();  
            Log.d(TAG, "statuscode = "+statusCode);  
            //���?�ص�httpResponse��Ϣ  
            result = retrieveInputStream(httpResponse.getEntity());  
        } catch (Exception e) {  
            Log.e(TAG, e.getMessage());  
            throw new Exception(e);  
        } finally {  
            getMethod.abort();  
        }
        return result;  
    }  
      
    /** 
     * ����httpResponse��Ϣ,����String 
     *  
     * @param httpEntity 
     * @return String 
     */  
    protected static String retrieveInputStream(HttpEntity httpEntity) {  
                  
        int length = (int) httpEntity.getContentLength();         
        //the number of bytes of the content, or a negative number if unknown. If the content length is known but exceeds Long.MAX_VALUE, a negative number is returned.  
        //length==-1��������䱨�?println needs a message  
        if (length < 0) length = 10000;  
        StringBuffer stringBuffer = new StringBuffer(length);  
        try {  
            InputStreamReader inputStreamReader = new InputStreamReader(httpEntity.getContent(), "UTF-8");  
            char buffer[] = new char[length];  
            int count;  
            while ((count = inputStreamReader.read(buffer, 0, length - 1)) > 0) {  
                stringBuffer.append(buffer, 0, count);  
            }  
        } catch (UnsupportedEncodingException e) {  
            Log.e(TAG, e.getMessage());  
        } catch (IllegalStateException e) {  
            Log.e(TAG, e.getMessage());  
        } catch (IOException e) {  
            Log.e(TAG, e.getMessage());  
        }  
        return stringBuffer.toString();  
    }  
}
